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Hot plugs, cold plugs

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sockeyedsushi

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Does anyone have any experience with plug heat ranges for a 73 Midget 1275? I have a Bosch book and 3 choices. I am using the cold one, but have some fouling on the 2 centre plugs. Valve guides are poor. I plan spring trip for about 2 days of driving and don't want to foul out on the trip and thought about going up one heat range to test the theory.
Any thoughts. /ubbthreads/images/graemlins/canpatriot.GIF
 
Sushi, your theory is sound.However,the heat range required depends on the type of driving you do. It appears that the current plugs and your driving style signal a too cold plug. I think a one step up will be about right if the new plugs do not foul.During the long drive they will perform even better.---FWIW--Keoke
 
Go hotter, and try NGKs. (BP5ES) Carry a spare set of plugs on the trip too. You can change them on a 1275 while you are getting gas.

Frank
 
Sushi, get a speed wrench and you will be amazed at how fast you can change plugs and it will help in not overtightening. Wayne
 
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